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I just had my Mason Hamlin A restrung it sounds much better than it did before, but the strings (Mapes) sound brighter than I would have thought. The characteristic of their tone has changed quite a bit too. Can I expect the tone to continue to change? Maybe to mellow out with time?

Are the strings the only thing that were replaced? Were the hammers replaced, or in any way voiced by the technician? Mapes strings are high quality strings both in the wound (Bass) and treble sections. New strings will sound brighter vs. old strings. You would mostly notice the difference in the bass section. Old wound strings get dirty in-between the windings and become dull or tubby sounding. With the new set of strings, I wouldn't look for the tone to continue to change. Other factors will affect the tone before the strings wear out. The hammers and the soundboard are the other two contributing factors to tone. I don't know how old your Mason and Hamlin A is, but they have the (Crown Retention System) under the soundboard. Keeping the crown on the soundboard it retains a beautiful tone. I would take a look at the hammers. How old and in what shape are the hammers in?

Only the strings were replaced, The piano was built in 1969 but has very light use so the hammers and action didn't need to be worked on. I was told that the sound board was in good shape too. The sound of all of the strings changed quite a bit. The treble strings used to sound sort of nasal. Now they seem to have more high overtones than they should. The lower wound strings sound great, but the upper octave of the wound strings is a "problem" area. The sound is inconsistent from string to string, so I would guess that it needs to be voiced.

If the strings were replaced but the hammers and action were not "worked on" it is understandable that the tone will probably be all over the place, and quite inconsistent.

If the hammers weren't replaced they should at least be repinned to their flanges, traveled, and reshaped. Then they can be aligned correctly to the strings, and voicing can then be done.

The new strings should also be leveled as necessary so that the hammers strike their respective strings at exactly the same time. Unleveled strings and hammers with old string cuts will never produce good, consistent tone.

It's also doubtful that any piano from the late 60s doesn't need action (regulation) work. Even if the parts are still functional they probably need adjustment and the quality of the work done here will have a profound impact on the quality of tone and touch.